Packing.



E. CHRISTENSEN.

PAGKING. APPLIUATION FILED NOV. 26 1009 Patented July 2, 1912.

WIT/maxim M u n l 6 M 4 army.

UNITED STATES PATENT onrircn EMIL CHRISTENSEN, 0F PORTLAND, OREGON.

PACKING.

Specification of Letters Patent.

Patented July 2, 1912.

Application filed November 26, 1909. Serial No. 530,025.

ative ty e.

The 0 ject of the invention is to provide means whereby leakage'of steam around the piston will be greatly reduced, if not entirely eliminated. Generally in mechanisms of this kind a number of piston rings have been mounted on the piston itself, but these rings have been unsatisfactory, and will allow leakage even when titted very tightly around the piston.

My invention consists in introducing a compressible packing in the walls of the .-cylinder, one of the cylinder heads being rendered adjustable and seated against the packing to allow for compression.

In the accompanying drawings forming part of this specification, Figure 1 is a detail sectional view of a fluid pressure operative friction clutch embodying my inven-' tion, Fig. 2 is a sectional view of the cylinder and piston, showing the position of the packing'and springs thcrein,I*ig. 3 is a transverse sectional view through r cyllnder.

In the drawing, 2 represents a shaft having bearings 3 and a gear wheel 4 rovidcd with a friction surface 5. 6 is a isk provided on one end of a drum 7 and having a friction surface 8 to engage the tapered sur-' face of the wheel 4. The drum is adapted to slide back and forth on the shaft toward and from the wheeld and is normally held out of engagement with the friction surface 5 by a spring 9. The end of the shaft .2 is bored to reccive a stem .10 of a piston 11 and a pin lllits within a transverse slot 13 in said shaft in the path of the stem 10, and is adapted to engage the end of the drum 7 and force it inwardly toward the ring 4. A

cylinder 14 is mounted on the end of the shaft 2 and has a removable head 15. The wall of said cylinder has an annular recess 16 wherein (!()l1'illll'0SSll)l0 packing rings l7 are arranged, composed preferably of hemp. The head 15 has a llangc l8 that is adapted to bear on these hemp rings and bolts It) pass'through said head and into the walls of the cylinder, serving to draw the cylinder head snugly against the packing rings until the desired degree of compression thereon is obtained. The piston llv has )referably a concave outer taco corresponding to the form of the cylinder head and bears on the compressible packing rings sullicient friction being generated between these rings and the piston to render the piston rather difficult of movement especially at start. I therefore provide a series of coiled springs the piston is forced inwardly to aid in returning it to its normal inoperative position and also to absorb the shock to the mechanism when admitting full pressure on piston too sudden. I have shown eight of these springs in Fig. 3, but a greater or less mini-- 'ber ma be provided, as desired. The degree o. compression between the packing rings and the piston can be increased or de creased according to the compression exerted on the packing rings by the head of the cylinder. Steam or other fluid pressure is introduced in the rear of the niston through a suitable pipe 21. By ')I0V'l( ing asuitable number of these compressible packing rings, preferably of the hemp type, I am able to render the piston practically steam tight and thereby eliminate a large part of the annoyance and delay incidental. to the operation of a device of this kind.

I have shown the packing used in con-- ncction with a steam cylinder for a lriction clutch. but do not conlinc myself to stll'lt use as it will hc l'ound ol great advantage whcrevcr a steam light pat-king aronnd a piston is required.

I claim as my inven ion l. 'lhc conibinatiom with a cylinder having an annular recess in its walls. and courprcssiblc pitching rings lilting within said recess, of a head l'or said cylinder having a llangc to hear on said rings. thc pressure of said flange operating to expand said rings. and a piston in said cylinder incloscd bv said rings and against thc surl'hcc of which said rings arc forced by the ctm'tprcssion ot said llangc. v

2. The colnbinatiim, with a cylinder having an annular recess in its walls and comprcssihlc packing rings lilting within said cylinder. of a piston for said ylinder adaptcd to slide within said rings and means tor applying pressure to said rings to expand them and increase their pressure on said piston.

20 which are put under compression when piston, of a compressible. packing arranged said head on said packing.

. having a bearing on said packing-and oper- I Witnesses:

3;. The (:embinaition with a cylinder and 61 increasing or decreasing the pressure of within said cylinder, the inner surface of i In witness whereof, I have hereunto setsaid packing being flush substantially with m y hand this 15th day of November 1909.

the inner surface of said cylinder, :1 head EMIL CHRISTENSEN.

ating to compress the same and force it W. H. CORBETT, aga nst the surface of sald p1ston,and means ELIJAH Consn'r'r. 

